Not sure what you're really asking here. Open ended straight draws have 8 outs and gut shot draws have 4. Flush draws have 9 outs.
With the str draws and flush draws you sometime have to discount some outs as certain cards can help your opponent more then you.
So if you're on a str 8(outs) draw and your opponent is on a flush draw you have to subtract two outs from your draw-the 2 outs that will give your opponent his flush. Hence you have a "str vs flush draw" with only 6 outs.
You have 8 outs to make a str-four 3's and four 8's but if the 3 or 8 of hearts come up you're opp gets his flush and beats you. So you really have only 6 out to make your str. 8outs-(3h,8h)= 6 outs.
Hope that helps.